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Learn how to view and modify field values and set breakpoints in the Integrated i5/OS Debugger.

 

Editor's Note: This article is an excerpt from the new MC Press book The Remote System Explorer: Modern Developer Tools for the System i.

 

Viewing and Modifying Field Values

One of the most important features of any debugger is the ability to examine the values of fields in the running program. The Integrated i5/OS Debugger provides three specialized views for this purpose: Variables, Monitors, and Memory.

 

Tip: Hovering the mouse over a field in the editor, while debugging, causes a window to pop-up and display the current value of the field. Moving the mouse causes the window to disappear again.

 

The displayed value for fields in any of the three views is updated automatically as you step through your program. The field name is highlighted in red and decorated with a blue triangle when the value of a field changes:

111208Yantzicon01.JPG

 

All three views allow you to change the value of a field. In the Variables and Monitors views, you can change the value of a field by right-clicking the field and selecting Change Value from the pop-up menu. In the Variables view, you can also edit the value of a field directly in the table.

 

Data structures and arrays show up in the Variables and Monitors views as expandable entries. Initially, only the name of the data structure or array appears, with a plus sign (+) next to it. Clicking the plus sign expands the entry to show the subfields or array elements.

 

The Variables View

 

The Variables view displays all variables (fields) defined in the currently selected call stack frame, as shown in Figure 1. If the mainline code of an RPG IV program is selected, this view shows all global fields defined for the program. If an RPG subprocedure is selected, the view shows the fields defined inside of the subprocedure.

 

111208Yantzifig01.JPG

Figure 1: The Variables View

 

It is common for an RPG program to contain many global fields. The Variables view has a handy "find" function for quickly finding and positioning to the field you are interested in. Within the view, press Ctrl+F, and a Find dialog appears, as shown in Figure 2. As you enter the name of the field in the dialog, the list of fields is filtered based on what you have typed. Once the field you are interested in is selected, click OK (or press Enter), and the Variables view is positioned to that field. The Find dialog supports generic search strings. For example, enter *ID* to see all fields that contain the string ID.

 

 111208Yantzfig02.JPG

Figure 2: Searching the Variables View

 

Like many Workbench views, you can apply a filter to the Variables view to show only a subset of the information. The Variables view provides the ability to show only user-defined variables or predefined variables (such as the indicators) using the Filter Locals action, available on the pop-up menu within the Variables view.

 

The Variables view has two restrictions. First, it only works when debugging i5/OS V5R3 or later and is only populated for ILE RPG and ILE COBOL source. Second, it does not support RPG's *INZSR, or mainline, subroutines. It does support the mainline code, subprocedures, and subroutines defined within a subprocedure.

 

The Monitors View

 

The Monitors view allows you to view and change the values of specific fields you are interested in by explicitly adding them to the view, as shown in Figure 3.

 

111208Yantzfig03.JPG

Figure 3: The Monitors View

 

To add a field to the Monitors view, select it in the debug editor, right-click, and select Monitor Expression from the pop-up menu.

 

Alternatively, the Monitors view provides an "add" action in the toolbar that allows you to type in the name of the field you wish to monitor:

111208Yantzicon02.JPG

 

Most of the other icons in the Monitors view's toolbar are common Workbench actions, such as "remove selected" and "remove all." The following actions are specific to the Monitors view:

 

•  Disable/Enable Monitored Expression (111208Yantzicon03.JPG): Use this action to temporarily disable the automatic updating of a field's value in the view. If you have a lot of fields added to the Monitors view and are noticing a delay while stepping through your program, you might want to disable or remove the fields that are not of interest. 

 

• Show Type Names (111208Yantzicon04.JPG):  This action is not applicable to debugging native i5/OS applications.

 

You can also right-click a field in the Monitors view to access additional actions, such as changing the value of the field (Change Value) or changing how the value is displayed (Change Representation). Using the Change Representation action, you can toggle between showing the value as hexadecimal and showing the system default for the field's data type.

 

Tip: One advantage of using the "add" action from the Monitor view is you can enter an array name with an array index. Suppose you are interested only in monitoring the tenth element of the orders array. You could enter ORDERS[10] as the expression instead of adding the entire array.

 

The Memory View

 

The Variables and Monitors views both show fields along with a visual representation of their contents. The Memory view allows you to dig deeper and look at the actual layout of a field in memory, as shown in Figure 4. The left side of the Memory view holds a list of the fields added to the view. The right side shows the memory contents for the selected field.

 

111208Yantzfig04.JPG 

Figure 4: The Memory View

 

To add a field to the Memory view, right-click it in the editor and select Monitor Memory from the pop-up menu. This action cascades into a list of options for how the contents of each memory location should be displayed. Select the correct option based on the field's data type, or select HEX to see the raw data in memory.

 

Once a field has been added to the Memory view, you can add and remove additional renderings using the view's toolbar actions. Additional rendering shows up as tabs on the right side of the view.

 

Setting Breakpoints

 

Most people think of a breakpoint as being set on a specific line of code in the debugger so that the debugger stops just before the line is executed. We refer to this as a line breakpoint. The debugger also allows breakpoints to be set in the Remote Systems LPEX Editor before the debugger is even started. We refer to these as source breakpoints, since they are set in the source editor. There are also watch breakpoints that can be set on a field to cause the debugger to suspend the program if the value of that field changes.

 

All breakpoints show up in the debugger's Breakpoints view, which provides a central place to work with them. A blue dot is the Workbench's universal symbol for a breakpoint. In Figure 5, some of the breakpoints have a checkmark over the blue dot. Those breakpoints are active in the current debug session.

 

111208Yantzfig05.JPG 

Figure 5: The Breakpoints View

 

From the Breakpoints view, you can do the following:

•·         Enable and disable breakpoints by toggling the checkbox beside the breakpoint.

•·         Remove breakpoints using the "remove selected" and "remove all" icons in the view's toolbar.

•·         Add breakpoints by right-clicking in the view and selecting Add Breakpoint > Line... or Watch... from the pop-up menu.

•·         Edit breakpoints to make them conditional. (Conditional breakpoints are discussed in more detail later in this chapter.)

•·         Use the pull-down menu to change how breakpoints are grouped. For example, to have all breakpoints grouped by their corresponding file (member), select Group By > Files.

Line Breakpoints

 

A line breakpoint can be set in the editor after the debugger is running. The most common way to set a line breakpoint is to double-click in the vertical ruler on the left side of the editor (to the left of the sequence numbers). Alternatively, right-click any executable line and select Add Breakpoint from the pop-up menu. Both actions set a line breakpoint on the selected line and add a blue breakpoint dot to the margin of the editor.

 

Double-clicking the blue dot removes the breakpoint. If you attempt to set a breakpoint on a non-executable line, the breakpoint will be set on the first executable line after the selected line.

 

Tip: To have the debugger run to a particular line and stop, right-click the line in the editor and select Run To Location instead of setting a breakpoint on the line, clicking "resume," and then removing the breakpoint once it's hit.

 

Source Breakpoints

 

A source breakpoint is the same as a line breakpoint, except that it is set in the Remote Systems LPEX Editor before the debugger is started. This is useful if you know you want to step through an exceptionally tricky section of code. This is a great example of integration within the Workbench. You can seamlessly flow back and forth between editing and debugging by setting breakpoints in the editor before debugging and then continuing to use the same editor while stepping through the code.

 

To set a source breakpoint, double-click in the vertical ruler of the editor. Alternatively, right-click any executable line and select Add Breakpoint from the pop-up menu. In either case, a blue dot should appear in the left margin, indicating the source breakpoint has been set. Unless you are already debugging, the blue dot will probably not have a checkmark on it. This means the breakpoint has not been added to a debug session yet.

 

Source entry points set in called programs and bound service programs need to have the called program or bound service program added to debug. Once the debugger is attached to the i5/OS job, you can add a program or service program to debug using the following steps:

 

1.       Make sure the job is suspended, either at a breakpoint or by selecting the job and clicking the Suspend button.

2.       Switch to the Programs view. By default, this appears in the tabbed notebook in the top right corner of the Debug perspective, as shown in Figure 6.

3.       Click the "add" icon in the view's toolbar.

4.       Enter the program name when prompted.

 

The program is now added to debug, and all source breakpoints related to the program should be activated.

 

Adding a program to the Programs view is comparable to using the system debugger's Add Program (ADDPGM) and Display Module Source (DSPMODSRC) commands.

 

111208Yantzfig06.JPG

Figure 6: The Programs View

Tip: The Programs view is actually called the Modules view. The name of the view is automatically changed when you are using the Integrated i5/OS Debugger. If you are looking for this view in the Show View menu, you will need to look for the Modules view.

 

Watch Breakpoints

 

We often come across situations where the value of a field is being unexpectedly modified, and we want to track down when in the program execution this occurs. This can be done using a watch breakpoint. Watch breakpoints are set on a field instead of a line of code. When the value of the field changes, the debugger displays a message box stating that the field has changed and suspends program execution. The current line in the debug editor will be the first executable line immediately following the line that caused the field to change.

 

To set a watch breakpoint, select the field in the debug editor, right-click, and select Watch... from the pop-up menu. Alternatively, right-click in the Breakpoints view and select Add Breakpoint > Watch.... This opens the Add a Watch Breakpoint dialog, shown in Figure 7. Enter the field name and number of bytes to watch, and click Finish. A value of zero for the number of bytes to watch means all bytes in the field are monitored for changes. A value of one or higher means that only that number of bytes of the field are monitored for changes.

 

111208Yantzfig07.JPG

Figure 7: Adding a Watch Breakpoint

Tip: You can enter an expression in the Add Watch Breakpoint dialog instead of a field name. For example, if you are only interested in knowing when location 89 of the PARTS array is modified, enter PARTS(89) for the expression.

 

Conditional Breakpoints

 

Bugs have a nasty way of waiting until the last iteration of a loop until they appear. If you're like us, you repeatedly press F6 as fast as possible to keep stepping through until that last iteration, only to accidentally press it a few too many times and miss the bug completely. (It's amazing that our F6 keys still work!)

 

Conditional breakpoints to the rescue! After a line or source breakpoint has been set, you can edit the breakpoint to make it conditional. To change how often (the frequency) a line breakpoint suspends the debugger, follow these steps:

1.       Right-click the line breakpoint in the Breakpoints view and select Edit Breakpoint.... This opens the Edit a Line Breakpoint dialog, shown in Figure 8.

2.       Click Next to proceed to the Optional parameters page.

3.       Change the frequency fields to adjust how often the breakpoint causes the debugger to suspend the job.

 

111208Yantzfig08.JPG 

Figure 8: Editing a Line Breakpoint

 

In addition to the frequency, you can enter a Boolean expression using fields from your program. When the breakpoint is hit, the debugger evaluates the expression to determine if the job should continue or suspend. If the expression evaluates to true, the debugger suspends the job; otherwise, the job continues. For RPG, this can only be a simple Boolean expression, not a compound expression.

 

Conditions on watch breakpoints have to be set when the breakpoint is added; they cannot be modified afterward. When setting the watch breakpoint, click Next on the first page to proceed to the Optional parameters page. Watch breakpoints allow the frequency to be set but do not support expressions.

Don Yantzi and Nazmin Haji

Don Yantzi joined the AS/400 application development tools team in 1998 as a tester for the Java generation capabilities in the VisualAge for RPG compiler. In 2000, he started working on the design and development of the RSE. Since then, Don has held various positions within the team, including technical release lead for WDS and WDSC. Currently, Don is the technical lead for WDSC and Rational Developer for System i. Don is a frequent speaker at System i conferences and user group meetings and has published numerous articles on the RSE.

Nazmin Haji joined IBM in 1988 as a software developer working on the ILE RPG compiler on AS/400. She worked on CODE/400, specializing in RPG features and enhancements and WDSC, migrating functionality from CODE/400 to WDSC and adding new functionality to RSE. Nazmin has assumed several leading roles in the RSE team, including team lead and technical lead. Nazmin is a frequent speaker in conferences and user groups.


MC Press books written by Don Yantzi and Nazmin Haji available now on the MC Press Bookstore.

The Remote System Explorer The Remote System Explorer
Learn to use modern application development tools to create and maintain applications in RPG, COBOL, CL and DDS.
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    This is a unique, online opportunity to hear how you can get more out of RDi.

     

  • Node.js on IBM i Webinar Series Pt. 2: Setting Up Your Development Tools

    Profound Logic Software, Inc.Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using NodeRun.com as a pre-built development environment

     

     

  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.